If you’re a bachelor then with 12LPA(base pay), you can live a pretty decent life and save. At 12LPA, you wont pay much tax, your in hand would be around 85-90k.
Your monthly expenses can be within 25-35k, buy stuff for yourself, invest some.
But as soon as you get married, your expenses would shoot up because you’ll need to have a house if your own (2BHK atleast). So in this case 20-25LPA base pay, and once you have kids, 35LPA+ atleast. This figure is for living a decent life, along with a little bit planning of future. Ofcourse, you can live a frugal life with much less.